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If it is hard to close the action on a neck sized round, then this is a sign that the brass needs to be full length sized, or at least partial full length sized to bump the shoulder back a bit.
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There are 'body dies' available that size the case and shoulder without touching the neck.
They are used when cases that have been neck sized become hard to chamber.
After a body die, the regular neck size die is still required to reduce the neck.